Final answer:
The text details are minimal and only reveal that Rose was treated 'kindly' by William; there isn't enough information to determine how William treats Susanna.
Step-by-step explanation:
The question asks how William, a character in a fictional text, treats other characters named Rose and Susanna. The details from the text that can be referred to suggest that interactions with Rose and Susanna are minimal, mentioning only that Rose was treated 'kindly.' The excerpts provided, however, do not give enough context about William's interactions with Susanna to draw a conclusion. The nature of William's relationship with Rose or Susanna is not detailed in these excerpts, indicating the need to review the text further for explicit examples of William's behavior towards these characters.